Quarterly report pursuant to Section 13 or 15(d)

Revenue from Contracts with Customers - Contract Balances (Details)

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Revenue from Contracts with Customers - Contract Balances (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]        
Accounts receivable, net $ 110,742 [1] $ 95,863 [1] $ 81,896 $ 85,985
Accounts receivable retainage, net 21,265 16,976 14,762 13,516
Contract Assets:        
Costs and estimated earnings in excess of billings 189,566 [1] 202,243 [1] 92,264 86,842
Contract Liabilities:        
Billings in excess of cost and estimated earnings $ 30,670 $ 32,178 $ 31,483 $ 30,706
[1] Includes restricted assets of consolidated variable interest entities (“VIEs”) at March 31, 2020 and December 31, 2019 of $163,019 and $158,912, respectively. Includes non-recourse liabilities of consolidated VIEs at March 31, 2020 and December 31, 2019 of $38,024 and $38,568, respectively. See Note 12.